Hammer-drill.



A. H. TAYLOR.

HAMMER DRILL APPLICATION. FILED OCT. 1. 19(37- m Z w 2 t WW w h m n v P L. ww m\ AR 9Q w W 6 n I UNITED STATES rains FFICE.

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- To all wliom it may concern:

Be i known-.tha't I, ALBERT H. TAYLOR, a citizen of the United States, and resident of Ea'ston, in the county of Northampton and State of Pennsylvania, have invented a 'new and useful Improvement in Hammer- Drills, ofwhieh the following isa specifi cation.

My invention consists in certain improvements in that class of pneumatic tools known as hammer drills in which an air ower feed is provided for forcing the tool prward and holding it in its working posi---' which the valve is.held onto its seat by.

spring pressurewhereby the wear thereon is taken up automatically.

My invention further consists in means for automatically locking thecontrolling valve in its difi'erent positions against any tendency to be displaced therefrom by the jars incident to the operation of the tool. A practical embodiment of my, invention is represented in the accompanying drawings, in whichigure 1 represents a portion of anair feed hammer drill in side elevation partially in longitudinal -central section with my invention ap lied thereto, the controlling valve being 5 iown in its closed position, Fig. 2 is a detail section showing the relative location of the ports in the valve and the head block when the valveis closed, Fig. 3 is a detail section showingthe ositions of the ports in the valve and head look when the valve is open, and Fig. 4 is a detail plan view of the locking plate carried by the Specification o1 Letters Patent. Patented Sept, 27, 1910, Application max October 1, 1907. Serial No. 395,3s9.-

head 5 is at all times open to external atmos here through ports 8 in the .outer end 6 o the cylinder.

be provided with a cock 10 for opening Y and closing the same.

The head block is provided with a hole th'erethrough having a. taper portion forming a seat 15 for the tapered portion 16 of the controlling valve. This controlling valve is provided with a cylindrical extension 17 having an angular thereon the loekin p ate 19 and the handle 20 exterior to the ead block; All wear beortion 18 for fixing.

tween the valve and its seat is taken up automa'tically by its spring 21 inter osed be tween the larger end of the said va ve and a cap 22 which has a screw threaded on agement with the hole through the head lock 2 exterior to-the taper portion which forms theseat 15.

The controlling valve is provided with a through port23and the head block is pro vided with ports 24, 25, leading respectively from the valve seat to the air feed space 26 and the hammer feed space 27.

. The locking plate 19 is provided with a shoulder 28 arranged to engage a stop 29 on the head block'2 when the valve is closed to limit its movement in that direction. The locking plate is further provided with a shoulder 30 arranged to engage said step 29 when the valve is open to limit the movement of the valve in that direction. The valve is locked against unintentional displacement in its open and closed positions by providing the locking plate with sockets 31, 32, arranged to alternately receive the rounded end of a spring actuated pin 33 mounted in the head block 2.

In operation, supposing the parts to be in the position shown in Figs. 1 and 2, the cook 10 in the supply pipe is first opened to admit the air to the air feed space 26 within the cylinder and piston. This will cause the tool to be fed up to its work. The controlling valve is then opened thus opening the air feed, to the hammer by bringing the ports 23, 24, 25, into line. When it is desired to stop the operation of the tool, the controlling valve is closed. lVhen it is desired to reset the tool, the cook 10 in the supply pipe is first closed. The controlling valve is then opened to permit the air with- Q in the air feed space to escape through the hammer.

- The construction herein set forth discloses a very simple and effective means for controlling. the supply of air to the tool andin.

the form shown a very ri' 'd formofconnec- .tion between the air fee cylinder and the tool is provided. Furthermore, the means for lockin the controlling valve against unintentiona vdisplacement obviates any daner of the valve; becoming dis laced by the ar incident to-the operation" 0 thetool.

While the invention has been described in connection withan air power feed hammer drill any other fluid power may be utilized i vand any type of tool may be employed without departing from the spirit and scope of.

' my invention.

' for .contro m What I claim is:-

In an air feed hammer drill, ahead block, I

an air. feed cylinder attached directly thereto, a hollow piston located in the said cylinder having its red extended rearwardly to.

form a rear support for the drill, an air supply pi 6 leading to said hollow piston and, a manua y o erated valve in the head block the communication between the air feed cylinder and hammer.

In testimony, that'I claim the foregoing as my invention, I have signed-my name in resence of two witnesses, this 28th; day of ptember,.1907. a 1 ALBERT H. TAYLOR,

Witnesses:

' WARDRAYMQND,

Y RUSSELL H. WmmaLM, 

